Mod List for 12V Engine Series ??

[Katmandu]

"Just" bought a 98 2500 4x4 w/12V CTD !!



I've been searching around (a few sites) and have yet to set a Comprehensive "MOD" list for the 12V Engine.



I'm interested in seeing a list that has MODs listed by "Bang-for-the Buck". In another words, what MODs are the least expensive and give the MOST performance increases ??





TIA!



-ERIC



PS - TDR looks like a GREAT website!

 

[JoshPeters]

Welcome! Be prepaired to loose your wallet!



Mods... oh man, this is a can of worms. If you have an Automatic... . Get it done and done right! Be Prepaired to spend around $4,000 for the good stuff.



Engine mods:

Bump the timing to 15. 5degrees

Fuel Plate

370 Injectors

Governor Spring Kit, 3,000 or 4,000rpm... . 4k you need stronger valve springs.

All those parts you can get for under $1000.

Go farther you ask... . no problem!

Delivery valves

Turbo/twins

Fire Rings or O-rings

stronger intercooler

camshaft

Fly Cut Ceramic coated Marine Pistons



The list is never ending.



Since we can't tell where your from, check out www.piersdiesel.com

They ALWAYS treat you right, and You'd be hard pressed to find people that know the Cummins better!



Josh

 

[DieselTweaker]

josh,,,, forgot about bumping the timing too :-laf





Eric



you have a fine platform to build on! just depends on what you want in the end. As stated above by josh that's a nice little list to get you started :-laf



Ack

 

[JoshPeters]

josh,,,, forgot about bumping the timing too :-laf





Eric



you have a fine platform to build on! just depends on what you want in the end. As stated above by josh that's a nice little list to get you started :-laf



Ack

Ya I forgot that one... . I've only set mine a couple of times.....



Edited and Added! :-laf



I have a feeling he'll throw a 10plate, 370's and a 3kGSK at it... . and not know what hit him! Oo. Oo. Oo. Oo. Oo.



Josh

 

[Jim Fulmer]

Is it an auto or 5 Speed.



With an auto he would be well pleased.



5 Speed... ..... I could blow his mind... ... . and clutch!





I remember(like yesterday) when I first got on the TDR in the fall of 01' and asked about turning the 12V up... ... . and you see were I'm at :-laf



Seriously, there are allot of really good people on here and will help you in most anything, I've asked questions from Trucks to Houses to Computers..... it's all here. This is the best money you have ever spent but it will make you spend more.



Jim

 

[Katmandu]

870HP ?!?!?!?!?!?!!!! Holy crap!!!

I'd be satisfied (for now) to get into the mid-300s.

My 98 12 V has a 5-speed transmission and does have "some" mods now.

I had a quick conversation with the previous owner Friday night (from the Stealership). He said it has a 280HP TST Torque plate, 4" Straight-pipe, K&N Air Filter and something about the wastegate spring (I haven't yet figured that one out).

Right now, I'm researching what the AFC and Spring wheel are and what they do and how to "Set" them.

What are their functions and how do I set them ??

 

[JoshPeters]

The AFC and star wheel are for controlling how fast the fueling takes place. As boost is added to the AFC it advances the fueling. If you turn the star wheel towards the engine (if I remember right, forward in the hole) It loostens the spring tension allowing the fueling to take place earlier. This can result in soot/smoke. You may find down the road that it fuels to quickly, if it does you may flood the turbo and have issues with spool up if you flat plant your foot on the floor.



But right now, you don't really need to worry about that. I'd recommend a 10plate, a good quality clutch, then a 3kGovernor spring kit, then 370's. With that combo, you should be well within your mid 300 range, and be looking for more..... bigger turbo, 0 plate, delivery valves..... before you know it your hoping to be Mr Fullmer!



Josh

 

[Katmandu]

But right now, you don't really need to worry about that. I'd recommend a 10plate, a good quality clutch, then a 3kGovernor spring kit, then 370's. With that combo, you should be well within your mid 300 range, and be looking for more..... bigger turbo, 0 plate, delivery valves..... before you know it your hoping to be Mr Fullmer!

Josh

Well, I have a 280HP Torque Plate and brand NEW clutch now, so I think I'm going to conserve my funds and work up from here.

So it looks like my NEXT logical mod should be a 3K GSK Spring set up ??

 

[Jim Fulmer]

But right now, you don't really need to worry about that. I'd recommend a #10 plate, a good quality clutch, then a 3kGovernor spring kit, then 370's. With that combo, you should be well within your mid 300 range



I can only say this because I've done it: a #10 plate, 3k's and stock injectors (215's that you have) can put you at 375 hp but your EGT's will be out of control. 320-330 is nice with a 16cm housing and EGT's aren't bad. You might consider a AFC spring kit for a 215 pump motor as the stock spring is a tight one.



You can go with the above combo and 370 and be at 450hp... . maybe a little more now(knowledge) and push it to 500 with water/meth... ... ... ok 496..... stock turbo and a 16 cm housing! Now pull the pump and have it tweaked and it will blow something up!



It's sick and don't go were I did! I like 400 hp, it's fun!



Jim

 

[Katmandu]

I can only say this because I've done it: a #10 plate, 3k's and stock injectors (215's that you have) can put you at 375 hp but your EGT's will be out of control. 320-330 is nice with a 16cm housing and EGT's aren't bad. You might consider a AFC spring kit for a 215 pump motor as the stock spring is a tight one.

Jim

Roger that Jim.

How much HP/TQ will stock 12 V Injectors handle (put out) ??

 

[Jim Fulmer]

There comes a point were you need to put a bigger injector in to give the pump a break. With 215's you can do 400 hp but like I said it will be hot. This is were you can add 370's either stock or honed or go to EDM's but I wouldn't do any of it till you have some air..... fuel is cheap with a 215 truck but air is expensive.



Jim

 

[Koa Man]

I hope the previous owner installed egt and boost gauges. If not, get those right away. I agree about the hp... . 400 is plenty and the truck is real fun to drive at that number.

 

[Forrest Nearing]

It's sick and don't go were I did! I like 400 hp, it's fun!



Jim

says the shaman... :-laf



400hp is fun, but more is more funner

 

[Katmandu]

There comes a point were you need to put a bigger injector in to give the pump a break. With 215's you can do 400 hp but like I said it will be hot. This is were you can add 370's either stock or honed or go to EDM's but I wouldn't do any of it till you have some air..... fuel is cheap with a 215 truck but air is expensive.

Jim

Roger that.

Can you explain "AIR" to me ?? Not sure what you're refering to... ...

And yes, the previous owner did install a EGT guage in it. I've only driven it about 80 miles since I bought it (Friday Night) and haven't "really" romped on it either. So far the EGT has stayed in the Green Zone.

My only real concern at this point is lack of power above 2200 RPMs. I know diesels run low with a low torque band, but it seems my truck totally runs out of breath after 2200 RPMs.

My goal (for right now), is to get it "tuned" right so all of my usable power is there (on tap). I'm aiming for the cheap/small/do-it-yourself type mods. The big $$$ Injectors and stuff are going to have to wait for a bit.

What is this AFC Spring Kit mod ??

What other mods should I be considering at this point ??

 

[Jim Fulmer]

Can you explain "AIR" to me



Needs more Air..... turbo to get real crazy and be able to use it, the stock turbo's do good but there limit is about 275-300 hp..... useable HP. Short bursts are no issue, at least not to me.



Jim

 

[Katmandu]

What is this AFC Spring Kit mod ??

What other mods should I be considering at this point ??<!-- google_ad_section_end --><!-- / message -->

 

[Bloomy]

The GSK will get you that power beyond 2200rpm. That is where the stock springs start to defuel. Look at what is in my signature. That is good for a little over 400hp and 900tq in a 175 pump. With your 215 pump you should be a fair amount above what I have with the same setup. It all goes in an order as listed by Josh with the gauges being first. Get to this level and try it for a while and see how you like it. If you want to go beyond plan on bigger money. Twins, pump work/custom pump, DD clutch, and so on and so on. A lot of power to be add if you are willing to pay to play. This is a great resource. Most of the 12v guys know a lot more than I do and are willing to share.



Thomas



edit: need to update my signature!

 

[Jim Fulmer]

What is this AFC Spring Kit mod ??



The 215 pump has a tight AFC spring like I run. On those it takes about 35-40 psi of boost (or air pressure) to make the AFC arm travel to the full forward position once the mods are done. In the AFC spring kit it has two different springs, one is what I call a 20 lb spring and the other is a 10 lb. I use the 20 lb spring and tighten up the star wheel tad without limiting full forward travel and set it to about 25 lb. What does that mean?



It means the way I set them up(when I get a chance) at 25 psi of boost you have full fuel, this makes all the power without huge amounts of smoke. If your charger/s make 40 psi or over then a 215 will be the one of choice but most mildly setup trucks won't or shouldn't make over 35 psi as the stock charger it is no good after that. Will they make big boost, yep but there screaming for mercy.



The 496 hp stock charger truck I was talking about makes 46 psi and not much smoke.



Jim

 

[TravisG]

Jim- is that 496 h. p. truck running again? I guess that is the same truck that was out in Phoenix earlier this year?

 

[Jim Fulmer]

Jim- is that 496 h. p. truck running again? I guess that is the same truck that was out in Phoenix earlier this year?

Nope, he actually made it back almost to New Mexico. He got it hot for too long! It beat up #6 cyl wall and piston but cracked the sleeve..... he wasn't even using the water to cool it either... ... horse/water you get the picture.



Shame too, it was a really good running truck till he tried to tow too heavy with it.



Jim